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I am mentioning the points on the topic of eco-friendliness of E-Ticketing system.

There may not be any harmful effects of e-ticketing systems directly on our ecosystem.  But the computers based on which e-ticketing works, have effects.

1. E-ticketing solution uses computer hardware.  The monitors used for display contain some harmful substances, which are not eco-friendly.  The discarded computer materials are called e-waste.  The may contain lead, cadmium etc.  SO exposure to harmful components of e-waste is not good. The mobile phones are also used for e-ticketing.  They are also part of e-waste when discarded.
  Recycling of e-waste can reduce the emission of greenhouse gases.

2.  Use of e-ticketing system increases the use of electronic telecommunication signals in the air.  It uses the telecommunication satellites in space.

3.  E-ticketing system uses computer print out or stationary.  Paper comes from wood pulp and hence from the trees in forests.  Thus e-ticketing causes cutting of trees.  The trees have to be regenerated using a disciplined and planned method.  

4.  I am not sure of these:
    The inks used in the printers or the toners may contain some non eco-friendly substances.  They may be prepared by use of some non eco-friendly processes.

5. These computers along with all the networking hardware, are always on.  The computers dissipate heat energy continuously.

6. The software has no effect on the eco-system, as it is present only on the electronic hardware.

It is possible that many parts of computers, except the functioning electronic components, could be made of eco-friendly and recyclable substances.  Perhaps there is a need for research on this.  Such decisions also depend on the economic feasibility, availability of technology and a big change in the computer industry in the whole world.

Imagine a computer in fine wooden or glass casing!

1.sometimes ink used in it may be non eco- friendly increases the communication causes cutting down of trees